Speaker
Prof.
Paola Verrucchi
(Instituto dei Sistemi Complessi - CNR, Italy)
Description
Decoherence is one of the main obstacles placed in the way
of the correct functioning of quantum devices. It is an
ubiquitous phenomenon, due to the unavoidable interaction
between a quantum principal system and its environment,
which becomes particularly disruptive when quantum
properties are to be exploited and controlled. Despite being
an ordinary effect, decoherence is not easily describable in a
general framework, as it depends on several details of the
physical setup. In this work, we make use of a recently
proposed method (PNAS 110, 6748 (2013)) for studying
the dynamical evolution of a generic quantum system
subject to decoherence. From such treatment, an analytical
expression for a consistent measure of the coherence time,
emerges, and formally shows how, and why, decoherence
depends on the number of dynamical variables of the
environment. Based on this result we propose a strategy for
effectively reduce decoherence, and finally implement it in
two exemplifying situations where decoherence must be
kept under control.
